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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974a544b7f3719596db2c97246855241148f61ddd52bad7567fa5ef258747f6e' 
  AND token = 'IA/zHUy2JUespio82OE+VJtlESX1HS1x6byHgNcGaJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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