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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0974ad735bb270ae037a609b8bf9189599d0cd8113c2809b9afc1e6b8a12f87d' 
  AND token = 'haKAF6TQMb+d2DEcTrCPoxTfP4cWXOLFQXJz4UvaPr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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