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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce0e94d7cff76dabf49987e48add6a8d3478efb408e45e473d9bf6af8926c81' 
  AND token = 'owR+oLDv1sxWa4HpxHWijZRvCJzO1jnS8994aCBhDTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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