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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bb67b64fa6e1528918482e4be24023781d9a4e0d02fc64216377931f6c5a05' 
  AND token = 'TY5+Ko0o3FkBw+uzS1Hnc+wl4PBdiUdP8tqP+oM50UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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