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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd0a80c5ff8596fa67b7ddc7a1ac8832caec6a30381a50bdac28358d4c5312d' 
  AND token = 'LvNAJnQwIzqfxDOn7jNL4K7ZqslqDDz9URcKI01oppY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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