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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f005b35f4b95934f39ed7450aa12c61c6ad39959acff7a74e6f9d05f576b28ca' 
  AND token = 'YNbPhFZaylvIYk6SlEk8RDObvCjeYveY6BDnWnjpan8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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