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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa24d3cb67bfb4722a968be6720e07c62eb194b04f2059b4a839d91fa5002d7' 
  AND token = 'JUvwSiDSlbzfe7cdl85x7o39QzD4yqZ7NdGKq5xQJio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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