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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1d5aa91ae08dfbe79579353f2a5a1cf7ad62ca9d7f648a4be6a1cb2ca2550b' 
  AND token = 'CVtVO0zjiSGY19VPr7gv9s3y282cJv43JYPpKkkWbeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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