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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ecd5b30f996a9ace5fa102c537d17e9564c53d38f740d63deb38373ee7ff53' 
  AND token = 'iNaN0U7eg/39aGy2I8AGgmXojpSmgEv8/NI2XjR0Qek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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