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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f9f5526797a3d79196f27c5e75034fbd389f1e25e78b65cd18aa1a7e9912a0' 
  AND token = '6eHypUqZd06Qytn0D0qct27B5hjDm1KT5hWn5H03NPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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