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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a3f2799bbbc5fad5b1c190f44a054d2e403040cdfd63b8612e67c0a63353ea' 
  AND token = '6eac1DVZalUj3EhLmZo9vwu3NDB7B0I8/4AoD9Ls3CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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