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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dfb88e90cad3134b32cdc7d165012a36b4d6430edfd8fb7a6c5c9bf2e842d6' 
  AND token = 'LQEgOtnfHlUs5RGKeeFlgiN1s6uMo7on8Cs8Jv+/Gt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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