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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf6b4a829104024dc4b570a8b38fecfbba4f7714c22b29824cfa25351ebd18d' 
  AND token = 'w3+lMpA1LJkQoMEe15kRni5Bwo141kK6snj2/fkOK5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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