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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30dd9ebb7e3c5530dce05f7fb27327cfe7dbe5f445bc39d61225aaaf2f31a85' 
  AND token = 'vh1wK8MzwG05dBKrh3axe7cq26yYVIzy+leKR4uzqg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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