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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651dcfd452a5b1a6c11009065c87d6c7efcfa654d63a7eb91c073ca9cb3fa3d9' 
  AND token = '1m2BRxY67WIej6E7evL9YpjOaXbk7Jmw3RdAiPg1mEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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