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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bf6865d867193658214f0049a457bd211425cf16f69e52334b82bdcd2ebb91' 
  AND token = 'goOnbXZUltc14Xz+e2fOT+81Abz58WlnSWF7GWmmLyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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