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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cafc1f1f7015d1fa9a85a44943ac598895df3d20b189978232b3af24082732' 
  AND token = 'u5c3Z5GFtw9dzp/EPn4NtdL4AG4z2wQbhNcM+cxtlCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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