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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ab665817ea0caf1e1372dc16e63e760200c57d1f550d1a0a09c58cd5b8976d' 
  AND token = '794KxX/6KZM8GnO+Qv3EN9wtCoTLoETuZWRvoHcueAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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