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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf1730ecd21c93582cb45d183c706ef86fbedd050ec425a58e1e74edc7bc05c' 
  AND token = 'vsvK0HvjaHICE1rzoDVWNtXBH4SuAH157vS0M8HOCa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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