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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceac50ca462afebae41a441e3fe115584b9dbcd3b8389fd4afb9d734c0081cfa' 
  AND token = '5WSl4HWYFLBLH6MyUkGCsO0UPcWVTwPlLawuaShMjKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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