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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbac1083b3439d349b9637bd28bb60fdbadc8dce54d80e2bcf8f20231353065' 
  AND token = 'hlilcPrJJy+J6pG8NClx+BK1i4Ohn1fx70vs8Nbpyhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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