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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b32e1b6e4fc80dc0ae3fdddf09e4b99df35d9c9f5061103c60e183daef72af8' 
  AND token = 'lHOrMeaNVfEvGf6+07pCnZRWyo/hj8E5zgxqaN3J/JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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