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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b100eab1b400ba8af220ed83622969ac76b9ee2e37df86bf3e0477203e200a' 
  AND token = '6c8IeDGbl5QCMVx9znTF6VZWQZhaIj1yrjx2ncZDhxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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