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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bea9a99b64ec293b0fe63d8dc6e3d51e6fceb722f3ce228607b1ff40347bb2e' 
  AND token = 'RDWBIH0vobUcsPZ4tnfixk6HQpfSr58KyGXbxrXRItU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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