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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347a662f0bb18f1901a2db900a7b74756106f135c814f8b0f39849ab83ded7b5' 
  AND token = '8/Kf4DaXn6+R3N3Ta3RGEDbEt450c/70RmrnR/XMEzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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