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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3d5987f5e031f0103663b28d5a2e98ca2fc12e5bd7ad7fad1027d2ff9dd6dd' 
  AND token = 'R36vY4uO8SSnW0EUZTqmIeLI9FLaMvrlENJk3opTCgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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