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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060ee4b0b0de9504f860776199c6d80ced4a88830eb7b803ed74605b21943af8' 
  AND token = 'aW0e57hCdF0PmFlGd71fcT7tHHMJFgtt/1iiGy17Zw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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