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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69bd62ca5a3b3718ba58acdd4d32685a87478d6d74ff8339f07a8816715b728' 
  AND token = 'MV86hfaJ5m8hBiAq+tG3q1Ht6YSQjI7hUmUG4l2xlEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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