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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fcf2e2e573f6ef8c21418bd12d3b52e6fba9af03a733618f6e93988106994e' 
  AND token = '5JMFlh2Q11oYH/tdb8dnsCwMs8NbtUml5l8tWITQ5qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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