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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4c8cd042be3b8d36310fe58d29b0414f97b23d7699e51a04837b15f252e857' 
  AND token = 'ebioirnwrCnHuV/gXNi3JKmbssP0tjVxrUbN5g3HElc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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