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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94dc3e0e9c480b029bdcf49e4c9303b4d248c1ea92e566877dcd994a1009b3d' 
  AND token = 'pTPFKGoyZsnwnW2re8sdyMHCF3fuCgduXj9WnfUMRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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