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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a316d82bb4009c01b763eaac079a8a8ef1262e996f88517390b3014d863872a7' 
  AND token = 'wDY1WHc3hX2OCtCn7H93YXn0kMyvXrcNyrh6ti0ptOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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