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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f4cc6ed3d58715f673e4b3d95c23e819671fe995202aa234d5cefa72dd14a2' 
  AND token = 'a96iGOy3BnamQu5XPFo+e99Og8acReb0jDEK8uBuiB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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