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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccbcc080c966c6b26446a09f7ae7652826e0bf568ab74a56a3f4814d1bf2feb' 
  AND token = 'HtFCDYI0uY5tzHnVh4fpBJ2yIFo/7En1UVrNJFvCBgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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