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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9ff5dce85a072a498662c5324496d485bb8b60bf1076e06df29965181b5d40' 
  AND token = '6alKfDiPIREws9K+TnjCxgtUbvhJkcwjWYD6AQapn9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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