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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba678b81474c2b9efab47e2eb994c639f99b7ecba4b5f504afe9a3cd34003ea' 
  AND token = 'vTv4+hWLsvJ4m9q6CSFOXJJaakNS2FtM8xQEoSMouR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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