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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0e8d8e37172aff77dd41ba480abe3f50bed6fed3eabf448054d25a5e44fdac' 
  AND token = 'XCAGvvMkm8PFV0ySAb5hZk3310snbkdjEDLtPX8B6sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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