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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e89bed2bbf9b81d20d746fb716242b58ae824faef26037a81dda2e9d0a2fcd' 
  AND token = '4jKnwPZ/gGojDpf1XRM2aDa1GRSWdcmuILNT8I8jN9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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