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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e96217e15c0d01fee3bd25451dd75cee3b8541a4d37decb839a8dd957bffa1' 
  AND token = 'ZY636idRux9Hg7CS4VG5RuCN53/3LYlGIOfovPEcbMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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