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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29a737dfbb43391409adb177bb42a9ca027f3ba7b69ea20a277a7efe81e8800' 
  AND token = 'lCjq+aZ2j58uzlCBWt4qJeUspg+MltmaGbpsVYwodXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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