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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2af5cd5d8a52e15fbac2a8cc6a6bbaa5c6e82e2aa662a57db1cc7c4f2ffa41b' 
  AND token = 'g4EXNXJAizvl9tR0Pl4YS7NSfcmiBwssB6C9CXpVfZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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