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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91863ba6e2dd87cb4aa2238ca33e99c718d99ba4ca0dbb47cfdd927c69488908' 
  AND token = '7VyGvxBkC4eWxOWdTr3Z1gqA742IMvGRaDfEStk0SeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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