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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5832a227fa61b836be93805e349bb4d9f1145eb9782ebc8ed634fd0f1643ac8f' 
  AND token = '7bL9bTdqLA6wag6QBT5RPghtUJ1rt9WBqlAxeSUllzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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