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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d1cc7d02b3065d20026b61ff07e6418bba4bd176a6ded99c18ed54dfcd3334' 
  AND token = '5RF0CjD6jeb+QeBy9J4ynZBh7198BVKPlp8sOCN2N14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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