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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578634b290c568835927d8767998dd8185ea03b522b1972d51a5ea47a3530d5b' 
  AND token = '781n4hH+0c1S4gKkJczUzqNp7sOF2cx1TWEJhPxFp+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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