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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf6750be1c8b8311e47d7426102b4a9412b78cfc27beba6d528638fab976ab6' 
  AND token = '/6cxOy4DA6A8CbKt0xufEN1dA7Ou3/clB8FArmk5yq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}