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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d45f5020e1ba44bb666a1e8f0e1cb5a5744254a62947be2d12d4846d356173' 
  AND token = 'vUjpSjv+V791eoK9ljopVoH4W/kqXjT/SRn/B3378xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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