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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7f514a0fd4781a21214d231f702c4bab4987b158ab36f78f1022da96cfd437' 
  AND token = 'hyPrg+30y7knj3pXWd4emNTWh+ZLcVXb9qW+rSOWpxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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