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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc419161338ca4ccddc4731b812d4e18ddd3b39b18a6f1e5cdf26d180ed95521' 
  AND token = 'voUysBhv6cpuw637T0HIKnO8Qg6i0Q//1hkIfK/7rDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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