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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc5284e4eff45028b9631dd4b6cc3e75cdbfafd8cc9c0612d48430ee03b73b0' 
  AND token = 'Uq+nsUK34NJAKoobU+T9muyyYvwHKF5Jeiw0xT3+Mpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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