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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475a29589e8b887cb9d1c202b0dc39a1ce4c36155dbd869b571278c8676bf9ef' 
  AND token = '2h6XSKgtmAlYBBupAiL3+seyZ9tEeYEmDjs+wCM53iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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