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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd917108dc7cd1652389116a7f0677e91aff82149b76ac07a3df5d961e9a785b6' 
  AND token = 'mCBwBDVDGkkRUVGgHDqkkvwZXbSrld9eCnlPy4mb2w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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