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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab36c6fb13590b8e0278370a588ded17a5cfcb9c85f85614223aef30d5c8c5a' 
  AND token = 'I5v4B6db7SvCJQjkxl8+QSiIX4TqShZUH0Bm0w8G+Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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