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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e87d8d3da77dcda4a7657f1d679903798091b45610880faec1473aa2ee77d0' 
  AND token = 'lF0ug9sX8GhqQiOMKAkWaeV6Ah6+w7E+01nqrjpev04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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