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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959712fb5932e38b9f899866217b3e33f93e068c809063b179d79a9c9575100a' 
  AND token = 'JGgXvGhV0LJW4FZdXcSN0iAXOtO5M1iGjhK56moEng4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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