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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac8b869d7be235e07dd6588806f827a911ae4f15602f728f8ed53ad6f0fae0a' 
  AND token = 'L9fgVY6KEalBtcRKnbzHfYnRcqPwECKddNM3a0CDjdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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