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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97356e8142fd0d06cf5eb8e99586a7e40042fdb33e2278d2279a13e60b3eb4f' 
  AND token = 'hPyNF2Bm3wmsiryTlLGk/4jPPu3kWzVPUiTOYbEp1u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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