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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768b732bb19b5593cbe9bfcdb4404e8e446f5ad05d0b320b98ca1cd0a240f2d4' 
  AND token = 'Uas0C0xFPxSHobdySUyW5pDQsshISSDVeGfzJpJlRys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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